The Raman spectra of various crystalline complexes formed between LiClO4 and poly(ethylene glycol) dimethyl ether oligomers CH3(OCH2CH2)nOCH3 with n = 1, 2 and 3 have been investigated in order to establish a clear vibrational assignment for the anion involved in typical solvent-separated ion pair, contact ion pair (with monodentate or bidentate coordination to the cation) and aggregate solvates. The Raman spectrum of the pure LiClO4 salt has also been recorded for comparison.
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Grondin et al. (2004) studied this question.